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Thread: CELL IDENTITY IN MOCN CASES-LTE SIB 1

  1. #1
    Junior Member Reputation: 12
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    Default CELL IDENTITY IN MOCN CASES-LTE SIB 1

    Hello,

    IN CASE OF MOCN - Multi-Operator CORE NETWORK SHARING ........we will have multiple PLMN IDs in SIB1 and only 1cell identity as given below .

    In this case, how can we conclude ECGI from SIB1 alone?

    ie how can we conclude the cellidentity belongs to which PLMN ID (In this case 3 PLMN Ids)
    Any help is highly appreciated.

    Sample:

    SEQUENCE BCCH-DL-SCH-Message {


    CHOICE BCCH-DL-SCH-MessageType {


    BCCH-DL-SCH-MessageType = c1 (0 dec, 0x0)


    CHOICE BCCH-DL-SCH-MessageType_c1 {


    BCCH-DL-SCH-MessageType_c1 = systemInformationBlockType1 (1 dec, 0x1)


    SEQUENCE SystemInformationBlockType1 {


    SEQUENCE SystemInformationBlockType1_cellAccessRelatedInfo {


    SEQUENCE PLMN-IdentityInfo {


    SEQUENCE PLMN-Identity {


    MCC-MNC-Digit = 3 (0x3)


    MCC-MNC-Digit = x (0x1)


    MCC-MNC-Digit = x (0x0)


    MCC-MNC-Digit = 1 (0x1)


    MCC-MNC-Digit = x (0x2)


    MCC-MNC-Digit = 0 (0x0)


    }


    cellReservedForOperatorUse = notReserved (1 dec, 0x1)


    }


    SEQUENCE PLMN-IdentityInfo {


    SEQUENCE PLMN-Identity {


    MCC-MNC-Digit = 3 (0x3)


    MCC-MNC-Digit = y (0x1)


    MCC-MNC-Digit = y (0x0)


    MCC-MNC-Digit = 8 (0x8)


    MCC-MNC-Digit = y (0x3)


    MCC-MNC-Digit = y (0x0)


    }


    cellReservedForOperatorUse = reserved (0 dec, 0x0)


    }


    SEQUENCE PLMN-IdentityInfo {


    SEQUENCE PLMN-Identity {


    MCC-MNC-Digit = 3 (0x3)


    MCC-MNC-Digit = z (0x1)


    MCC-MNC-Digit = z (0x2)


    MCC-MNC-Digit = 5 (0x5)


    MCC-MNC-Digit = z (0x3)


    MCC-MNC-Digit = z (0x0)


    }


    cellReservedForOperatorUse = notReserved (1 dec, 0x1)


    }


    TrackingAreaCode = '1F12'H


    CellIdentity = '0011111101011100101101000011'B


    cellBarred = notBarred (1 dec, 0x1)


    intraFreqReselection = allowed (0 dec, 0x0)


    csg-Indication = FALSE (0 dec, 0x0)


    }

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  3. #2
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    I understand you need to use cellId present also in SIB1 (not physical cellId)
    apparently this cellId has 28bits of which the first 20 is eNodeBId
    then with you plmn+ECI you can identify in case of mocn




    Quote Originally Posted by eta004 View Post
    Hello,

    IN CASE OF MOCN - Multi-Operator CORE NETWORK SHARING ........we will have multiple PLMN IDs in SIB1 and only 1cell identity as given below .

    In this case, how can we conclude ECGI from SIB1 alone?

    ie how can we conclude the cellidentity belongs to which PLMN ID (In this case 3 PLMN Ids)
    Any help is highly appreciated.

    Sample:

    SEQUENCE BCCH-DL-SCH-Message {


    CHOICE BCCH-DL-SCH-MessageType {


    BCCH-DL-SCH-MessageType = c1 (0 dec, 0x0)


    CHOICE BCCH-DL-SCH-MessageType_c1 {


    BCCH-DL-SCH-MessageType_c1 = systemInformationBlockType1 (1 dec, 0x1)


    SEQUENCE SystemInformationBlockType1 {


    SEQUENCE SystemInformationBlockType1_cellAccessRelatedInfo {


    SEQUENCE PLMN-IdentityInfo {


    SEQUENCE PLMN-Identity {


    MCC-MNC-Digit = 3 (0x3)


    MCC-MNC-Digit = x (0x1)


    MCC-MNC-Digit = x (0x0)


    MCC-MNC-Digit = 1 (0x1)


    MCC-MNC-Digit = x (0x2)


    MCC-MNC-Digit = 0 (0x0)


    }


    cellReservedForOperatorUse = notReserved (1 dec, 0x1)


    }


    SEQUENCE PLMN-IdentityInfo {


    SEQUENCE PLMN-Identity {


    MCC-MNC-Digit = 3 (0x3)


    MCC-MNC-Digit = y (0x1)


    MCC-MNC-Digit = y (0x0)


    MCC-MNC-Digit = 8 (0x8)


    MCC-MNC-Digit = y (0x3)


    MCC-MNC-Digit = y (0x0)


    }


    cellReservedForOperatorUse = reserved (0 dec, 0x0)


    }


    SEQUENCE PLMN-IdentityInfo {


    SEQUENCE PLMN-Identity {


    MCC-MNC-Digit = 3 (0x3)


    MCC-MNC-Digit = z (0x1)


    MCC-MNC-Digit = z (0x2)


    MCC-MNC-Digit = 5 (0x5)


    MCC-MNC-Digit = z (0x3)


    MCC-MNC-Digit = z (0x0)


    }


    cellReservedForOperatorUse = notReserved (1 dec, 0x1)


    }


    TrackingAreaCode = '1F12'H


    CellIdentity = '0011111101011100101101000011'B


    cellBarred = notBarred (1 dec, 0x1)


    intraFreqReselection = allowed (0 dec, 0x0)


    csg-Indication = FALSE (0 dec, 0x0)


    }

  4. #3
    Junior Member Reputation: 12
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    Hi,

    Yes, but my concern is which of the given PLMN is related to the given Cell identity.
    There are 3 PLMNs in SIB1, it can be of the same operator Say "Sprint " where there is no chance of MOCN or can be of ATT, Tmobile & Sprint in case of say
    MOCN ...So which PLMN corresponds to the cell identity ?? Is it the 1st PPLMN reported or any other way b..sincw we have 3 PLMNs and 1 cell identity to get the ECGI.

  5. #4
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    it will use the first one, which is the eNB belong to.

  6. #5
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    Taking a guess here because i will need to confirm this; unless configured differently, Tracking Area Code and the Cell Identity are the same for both PLMNs, hence only one value comes in SIB1

  7. #6
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    Can u please share any 3gpp specs in support of this statement..?

    Quote Originally Posted by crazyfind View Post
    it will use the first one, which is the eNB belong to.

  8. #7
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    I can confirm you that only 1 cell identity is reported in SIB1, as I can see only 1cell identity in all the log files even when there are multiple PLMNs in the SIB1.

    Quote Originally Posted by tanz View Post
    Taking a guess here because i will need to confirm this; unless configured differently, Tracking Area Code and the Cell Identity are the same for both PLMNs, hence only one value comes in SIB1

  9. #8
    VIP Member Reputation: 1849 wolverine's Avatar
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    1 out of 1 members found this post helpful.

    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    Hi,

    crazyfind is correct. See below..

    From TS 36.300 E-UTRA and E-UTRAN Overall description (section 8.2)

    E-UTRAN Cell Global Identifier (ECGI): used to identify cells globally. The ECGI is constructed from the
    PLMN identity the cell belongs to and the Cell Identity (CI) of the cell. The included PLMN is the one given by
    the first PLMN entry in SIB1
    , according to TS 36.331.

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  11. #9
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    Good !, that we confirmed.Thatz the answer I was waiting for. !


    Quote Originally Posted by wolverine View Post
    Hi,

    crazyfind is correct. See below..

    From TS 36.300 E-UTRA and E-UTRAN Overall description (section 8.2)

    E-UTRAN Cell Global Identifier (ECGI): used to identify cells globally. The ECGI is constructed from the
    PLMN identity the cell belongs to and the Cell Identity (CI) of the cell. The included PLMN is the one given by
    the first PLMN entry in SIB1
    , according to TS 36.331.

  12. #10
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    Default Re: CELL IDENTITY IN MOCN CASES-LTE SIB 1

    i also believe that.
    i will confirm with some colleagues today.

    Quote Originally Posted by tanz View Post
    Taking a guess here because i will need to confirm this; unless configured differently, Tracking Area Code and the Cell Identity are the same for both PLMNs, hence only one value comes in SIB1

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